Pump



J1me 1968 LA VERN R. CONNELLY 3,388,670

PUMP

Filed Sept. 16, 1966 FIG! /NVENTOR 5 M 3 WW T w wn R m V A L UnitedStates Patent 3,388,670 PUMP La Vern R. Connelly, Marshall, Mich.,assignor to Eaton Yale & Towne Inc., Cleveland, Ohio, a corporation ofOhio Filed Sept. 16, 1966, Ser. No. 580,087 Claims. (Cl. 103-205) ThePresent invention relates generally to an apparatus including a pair ofdrive transmitting members one of which is drivingly received in anopening in the other and particularly relates to a pump apparatus havinga rotatable drive shaft which is drivingly secured in an opening in adrive member which is rotatable to effect rotation of the drive shaft.

The preferred embodiment of the present invention to be described hereinrelates to a rotary pump. The rotary pump has a housing supporting apumping rotor means which is driven by a tubular or hollow shaft.Rotation of the pumping rotor means by the hollow shaft effects pumpingof a fluid from the pump inlet to the pump outlet. The pump isconstructed so that the hollow dri-ving shaft is utilized as a flowpassage for a portion of the circulating fluid and is rotated to drivethe pumping rotor means by a drive transmitting member which has anopening therein in which the shaft is drivingly received.

An object of the present invention is the provision of a new andimproved apparatus wherein a first drive member drivin-gly connectedwith a mechanism is received in an opening in a second drive member anddrivingly secured therein due to apparatus which effects tightengagement therebetween and wherein the tight engagement is provided byan insert member which is forcibly engaged in an opening in the firstmember and effects expansion of the first member into tight engagementwith the second member.

Yet another object of the present invention is the provision of a newand improved apparatus, as set forth above, wherein the opening in thefirst drive member includes an enlarged portion having a largerdiametrical extent than the diametrical extent of the insert member topermit relaxation of the first drive member upon movement of the insertmember into the enlarged portion so that the second drive member may beremoved from the first.

A still further object of the present invention is the provision of anew and improved pump including a driving shaft effective to drive apumping means and wherein the driving shaft includes an opening thereinforming a flow passageway for circulating fluid upon operation of thepumping means, and wherein the shaft is drivingly connected to a drivetransmitting element by an insert member which is forced into theopening in the shaft to expand the shaft into engagement with the drivetransmitting element and which closes the opening against leakage of thecirculating fluid therefrom.

A further object of the present invention is the provision of a new andimproved method of releasably securing a first drive member on the pumphead of a second drive member which includes expanding the second drivemember into tight engagement with the first drive member by forcing aninsert into an opening in the second drive member and providing forremoval of the first drive member by further movement of the insert intothe opening in the second drive member.

Other objects and advantages of the present invention will be apparentfrom the detailed description thereof made with reference to theaccompanying drawings which form a part of the specification and inwhich:

FIG. 1 is a sectional View of an apparatus embodying the presentinvention, with portions thereof in elevation;

FIG. 2 is a fragmentary sectional view of a portion of 3,383,670Patented June 18, 1968 "ice the apparatus shown in FIG. 1 on an enlargedscale; and

FIG. 3 is a sectional view of the apparatus shown in FIG. 1 takenapproximately along section line 3-3 of FIG. 1.

The present invention provides an improved apparatus including a pair ofdrive transmitting members one of which is drivingly received in anopening in the other and particularly provides an improved manner ofdrivingly connecting such members. The invention may be embodied indifferent apparatuses which have a wide variety of applications. Asrepresenting the preferred embodiment of the present invention, a pump10 is illustrated in the drawings. The pump 10 is adapted to be used ina hydraulic power steering system of an auto motive vehicle or the likeand is driven from the engine of the vehicle. However, it will beapparent that a pump embodying the invention is suitable for use inapplications other than automotive power steering systems.

The pump 10 includes a housing 11 containing a rotary pumping means 12secured to a driving shaft 13 for rotation therewith. A drivetransmitting element 14 is secured to the driving shaft 13 by meanswhich will be more fully described hereinafter and effects rotation ofthe shaft 13 upon rotation thereof. The driving element 14, which ishere shown as a pulley, is driven by an associated power means, such asan engine of the automotive vehicle, not shown, in which the pump isused.

The rotary pumping means 12 may be of any suitable construction but asshown includes a rotor member or carrier 20 which is suitably connectedto the shaft 13 for rotation therewith. The rotor or carrier member 20is a generally annular member and includes a plurality of radial slotstherein. The slots are spaced circumferentially about the rotor memberand carry pumping elements which, in the preferred embodiment, arecylindrical roll members 21. Upon rotation of the rotor or carriermember 29, the rolls 21 contact an arcuate cam surface 22 of a cammember 23 which is located radially outwardly of the rotor or carriermember 20 and fixed in the housing 11. The cam surface 22 is soconfigured that as the rotor or carrier member 20 rotates, the rolls 21move radially inwardly and outwardly thereof and pumping is accomplishedin a well-known manner. The cam surface 22 may be shaped so as toprovide for a single or plurality of pumping strokes of the rolls 21 foreach revolution of the rotor or carrier member 20. As shown in FIG. 3,two pumping strokes are provided for each revolution of the rotor orcarrier 20.

The rotor 20 and the cam member 23 are disposed closely adjacent a cov rmember 25 which is fixed in the housing 11. The cover member 25 supportssuitable bearing means 25, in the form of a bushing, and which supportsthe shaft 13 for rotation relative to the cover member 25. The covermember 25 additionally includes fiuid passageways which provide theinlet and discharge passages 27, 28, respectively, for the pump 10.

An end plate 30 is positioned closely adjac nt the rotor or carrier 20and the cam member 23 at the side thereof opposite to the cover 25 andis held closely adjacent the end of a cam member 23 and in registrytherewith by means of suitable screws 31, which extend through holes inthe end plate 30 and the cam member 23, and are threadedly engaged withthe cover 25. The end plate 30, cam member 23 and cover member 25 arelocated radially with respect to each other by a locating pin 32, whichextends into suitable holes in the end plate 30, cam member 23, and thecover 25. In the illustrated embodiment, the subassembly formed by theend plate 30, the cover 25 and the cam member 23 is pressed into thehousing 11 and is thereby fixed against rotation relative to thehousing. The shaft 13 is supported by a suitable bearing 36 carried bythe end plate 30 and which permits rotation of the shaft 13 relative tothe end plate 30.

The end plate 30 is maintained in sealing engagement between the housing11 and the shaft 13 by means of an O-ring type seal 33 which encirclesan outer periphery of the end plate 30 and sealingly engages a flange 34of the housing 11. The end plate 30 additionally carries acartridge-type lip seal 35 at its outer end which is effective to form aseal between the end plate 30 and the shaft 13.

The end plate 30 includes grooves or fluid chambers 40, 41 which areformed in an annular surface 42 of the end plate 30 and are locatedadjacent the intake of the rotary pumping means 12 and form intakechambers. The grooves 40, 41 communicate with an area adjacent the seal35 by means of passages 45, 46. The passage 46 communicates directlywith the groove 41 while passage 45 communicates with passage 46 andgroove 40. Additionally, the surface 42 of the end plate 30 includesgrooves or passageways 47, 48 which communicate with the dischargepassage 28 in the cover 25.

The shaft 13 is a tubular shaft and includes a central passageway 49extending therethrough and which communicates with the seal 35 and thegrooves 40, 41v in the end plate 30 by means of ports 50. The ports 50extend from the passageway 49 to the outer periphery of the shaftadjacent the seal 35 and communicate with the passage 46. The shaftpassageway 49 at the end thereof designated 49a communicates with thepump inlet passage or chamber 27.

From the above, the flow or fluid through the pump upon operationthereof should be apparent. The fluid flows into the pump inlet chamber27 and into the rotor 26 from the opposite sides thereof. The fluidflows from chamber 27 directly into the rotor on the right side thereof,as viewed in the drawings. The fluid flows to the left side of the rotor20, as viewed in the drawings, through shaft passageway 49, radialopenings 50, and passageways 46, 45 to the inlet grooves 40, 41. Fluidalso flows to groove 40 through passage 40a in cam 23. The fluid isdischarged from the rotor on the right side thereof, as viewed in thedrawings, directly into the discharge chamber 28 and from the left sideof the rotor into chamber 47 and passage 48. Passage 48 communicateswith the discharge chamber 28 through opening 48a in the cam member 23.

As shown in FIG. 2, the drive transmitting element 14 is a pulley havinga central hub portion 60, and a web portion 61, having a belt engagingeV-groove 62 formed at its outer periphery. Although the drivetransmitting element is illustrated and described as a pulley, it shouldbe apparent that any suitable form of drive transmitting element may beused. In accordance with the present invention, the pulley 14 isdrivingly connected to the outer periphery of the shaft 13. The drivingconnection is effected by an expanded portion of the shaft 13 which isreceived in an opening in the pulley hub and in tight engagement withthe hub 60. p

The tight engagement is provided by an insert member 65 which isforcibly engaged in an opening 66 at the end of the shaft member 13,which opening communicates with the passageway 49. Prior to assembly ofthe drive transmitting element 14 on the shaft 13, the inner diameter ofthe hub portion 60 and the outer diameter of the shaft 13 are of suchsize that the drive transmit ting element 14 may be slipped onto the endof the shaft 13. The insert member 65 has a diametrical interferencewith opening 66, that is, the diameter thereof is greater than thediametrical extent of the opening 66 in the shaft 13, so that when theinsert member is forcibly pressed into the opening 66, the Walls of thehollow shaft 13 are urged outwardly or expanded into tight engagementwith the inner periphery of the hub portion 60 of the pulley 14. Becauseof the expansion of the end of the shaft into engagement with the innerperiphery of the hub 60, the drive transmitting element 14 is drivinglyconnected to the shaft 13. The shaft, of course, is sufficientlyyielclable so as to be expanded by the insert member 65.

As shown in FIG. 2, the insert member 65 is a spherical member and theopening 66 is circular. When the insert member 65 is secured in theopening 66, fluid in the central flow passage 49 of the shaft 13 isprevented from leaking past the insert member and out of the open end ofthe shaft, by the fluid tight engagement of the insert member 60 and thewall of the shaft 13 defining the opening in which the spherical memberis received. Thus, the insert member 65 functions as a fluid seal aswell as securing the pulley 14 on the shaft 13. While the insert member65 is preferably spherical and the opening 66 circular, othergeometrical configurations of these elements could be used.

In the event that the drive transmitting element 14 is to be removedfrom the shaft 13, the insert member 65 is pressed into the shaft in adirection toward the end plate 30 and into the flow passage 49 which isof larger diametrical extent than the opening 66. The passage 49 ispreferably of larger diametrical extent than the insert member 65 sothat the insert member 65 is freely movable into the passage 49, asshown in dotted lines in FIG. 2. When the insert member 65 is moved intothe passage 49, the end of the shaft upon which the drive transmittingelement 14 is mounted relaxes and the drive pulley 14 may be removedtherefrom. The same or a different pulley 14 may be positioned on theshaft 13 by slipping the pulley on the shaft 13 and pressing anadditional insert into the opening 66 as described. The illustratedembodiment of the invention includes means for preventing the insertmember 65 which has been pressed into the passageway 49 from interferingwith fluid flow through the ports 50. As illustrated, the shaft 13includes an annular shoul der 70 extending into the passageway 49 at aposition intermediate the ports 50 and the opening 66 and which has adiametrical extent which is smaller than that of the insert member 65.When the insert member 65 has been pressed into the passageway 49, it isloosely received therein but cannot move past the shoulder 70 toward theports 50 due to interference with the shoulder 70. While the provisionof the shoulder 70 is illustrated in the pre ferred embodiment, itshould be apparent that different structure may be provided to preventthe member 65 from blocking the ports 50.

It can be seen now that a new and improved apparatus has been providedwhich is effective to drivingly connect one drive member in an openingin another in an uncomplicated and inexpensive manner. It is furtherapparent that the pump apparatus embodying the present inventionutilizes an insert which is effective to sealingly close an open end ofa tubular drive shaft permitting the tubular shaft to be utilized as aflow passageway for fluid.

While a preferred embodiment of the present invention has been describedand illustrated herein in considerable detail, the present invention isnot intended to be limited to the precise construction disclosed. It isintended to cover hereby all adaptations, modifications, and uses ofthis present invention which come within the scope of the appendedclaims.

Having described my invention, I claim:

1. An apparatus comprising pumping means, shaft means for driving saidpumping means, a drive transmitting member having an opening defined byan inner surface surrounding an end portion of said shaft means anddrivingly connected therewith to effect rotation of said shaft meansupon rotation of said member, said shaft means having an opening in saidend portion, and means providing said driving connection between saidshaft means and said drive transmitting member including a memberlocated in said opening and expanding the outer periphery of said shaftmeans into tight engagement with said inner surface of said drivetransmitting member to effect said driving connection therebetween.

2. An apparatus as defined in claim 1 wherein said opening is centrallylocated in said shaft and extends axially thereof and communicates witha passageway for fiuid circulating in said pump, and said member havingan outer surface portion in sealing engagement with said inner surfaceto block leakage of said fluid from said opening.

3. An apparatus as defined in claim 1 and wherein said member isinterferingly engaged in an opening in said shaft means to effect saidexpansion of said shaft means.

4. An apparatus as defined in claim 1 wherein said opening includes anenlarged portion adjacent said memher, said enlarged portion freelyreceiving said member upon movement thereof into said portion, and saidend of said shaft relaxing upon movement of said member into saidportion thereby providing for removal of said drive transmitting memberfrom said shaft means.

5. An apparatus as defined in claim 4 wherein said member is a sphericalmember and said opening is circular, said member having a diametergreater than the diameter of said opening prior to insertion into saidopening.

6. An apparatus comprising a first driving member, a second drivenmember, one of said members including a continuous outer peripheryadjacent an end thereof and received in an opening in the other member,said opening being defined by an inner peripheral surface of said othermember, said one member having an opening therein in said end thereof,insert means in said opening in said one member urging said periphery ofsaid one member radially into tight driving engagement with said innerperipheral surface of said other member to drivingly connect saidmembers, and means other than said insert means drivingly connected withsaid one member.

7. An apparatus as defined in claim 6 wherein said insert memberincludes a peripheral surface portion which tightly engaged with saidinner peripheral surface of said one member continuously therearound.

8. An apparatus as defined in claim ,6 wherein said opening in said onemember communicates with an enlarged passage portion adjacent thereto,said enlarged portion having a diametrical extent which is larger thanthe diametrical extent of said insert member so as to freely receivesaid insert member.

9. An apparatus comprising first and second drive transmitting members,one of said members having an end portion received in an opening in theother member, said opening being defined by an inner peripheral surfaceof said other member, said one member having an opening therein in saidend portion thereof, said opening in said one member communicating withan enlarged passage portion adjacent thereto, and insert means in saidopening in said one member urging the periphery of said end portion ofsaid one member radially into tight driving engagement with said innerperipheral surface of said other member to drivingly connect saidmembers and movable into said enlarged portion to permit reiaxation ofsaid end portion and removal of said other member therefrom.

10. A method of forming a drive connection between a first member havingan opening in an end thereof which communicates with an enlarged passageportion and a second member having an opening receiving the end of saidfirst member comprising the steps of providing an insert member having adiametrical extent larger than the diametrical extent of said opening insaid first member but less than the diametrical extent of said enlargedpassage portion, forcing said insert member into said opening, expandingthe periphery of said end of said first member into driving engagementwith the inner surface of said second member defining the openingtherein by said forcing, and forcing said insert member from saidopening into said enlarged passage portion of said first member therebyrelaxing said periphery of said first member and permitting removal ofsaid second member from said first member.

References Cited ROBERT M. WALKER, Primary Examiner.

1. AN APPARATUS COMPRISING PUMPING MEANS, SHAFT MEANS FOR DRIVING SAIDPUMPING MEANS, DRIVE TRANSMITTING MEMBER HAVING AN OPENING DEFINED BY ANINNER SURFACE SURROUNDING AN END PORTION OF SAID SHAFT MEANS ANDDRIVINGLY CONNECTED THEREWITH TO EFFECT ROTATION OF SAID SHAFT MEANSUPON ROTATION OF SAID MEMBER, SAID SHAFT MEANS HAVING AN OPENING IN SAIDEND PORTION, AND MEANS PROVIDING SAID DRIVING CONNECTION BETWEEN SAIDSHAFT MEANS AND SAID DRIVE TRANSMITTING MEMBER INCLUDING A MEMBERLOCATED IN SAID OPENING AND EXPANDING THE OUTER PERIPHERY OF SAID SHAFTMEANS INTO TIGHT ENGAGEMENT WITH SAID INNER SURFACE OF SAID DRIVETRANSMITTING MEMBER TO EFFECT SAID DRIVING CONNECTION THEREBETWEEN.